The V_c-sigma_c relation in high and low surface brightness galaxies

Details The V_c-sigma_c relation in high and low surface brightness galaxies The V_c-sigma_c relation in high and low surface brightness galaxies

2004-04-14

arxiv.org/abs/astro-ph/0404284v1

Astronomy and Astrophysics

Astrophysics

2 pages, 2 figures, to appear in Proc. IAU Symp. 222, "The Interplay among Black Holes, Stars and ISM in Galactic Nuclei" eds.

Scientific paper

10.1017/S1743921304002029

We investigate the relation between the asymptotic circular velocity, V_c, and the central stellar velocity dispersion, sigma_c, in galaxies. We consider a new sample of high surface brightness spiral galaxies (HSB), low surface brightness spiral galaxies (LSB), and elliptical galaxies with HI-based V_c measurements. We find that: 1) elliptical galaxies with HI measurements fit well within the relation; 2) a linear law can reproduce the data as well as a power law (used in previous works) even for galaxies with sigma_c < 70 km/s; 3) LSB galaxies, considered for the first time with this respect, seem to behave differently, showing either larger V_c values or smaller sigma_c values.

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